Re: Getting to the bottom of the Dreamcast DMA issue

[Adrian M. <ad...@ne...>]

On Tue, 2007-07-17 at 06:08 +0900, Paul Mundt wrote:

> 
> That's certainly not good. I suppose I'll have to plug in some dummy
> DMACs and hash out where things went wrong. I'll take a look at it later
> today.
> 
> Should also probably redo the dependencies so we're not able to
> artificially change the number of channels (or better yet, let the
> platform device take care of it).

Finally managed to test this properly with earlyprintk - here is the
output - much as with the module insertion:

Linux version 2.6.22-gc2dc1ad5 (adrian@bossclass) (gcc version 3.4.6)
#10 PREEMPT Mon Jul 16 22:52:32 BST 2007
console [sercon0] enabled
Booting machvec: Sega Dreamcast
Node 0: start_pfn = 0xc000, low = 0xd000
Zone PFN ranges:
  Normal      49152 ->    53248
early_node_map[1] active PFN ranges
    0:    49152 ->    53248
Built 1 zonelists in Zone order.  Total pages: 4064
Kernel command line: console=ttySC1,115200 panic=3 root=/dev/nfs rw
nfsaddrs=192.168.61.55:192.168.61.50:192.168.61.50: earlyprintk=serial
PID hash table entries: 64 (order: 6, 256 bytes)
Using tmu for system timer
Using 12.469 MHz high precision timer.
Console: colour dummy device 80x25
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
Memory: 14104k/16384k available (1499k kernel code, 444k data, 72k init)
PVR=040205c1 CVR=00000000 PRR=00000000
I-cache : n_ways=1 n_sets=256 way_incr=8192
I-cache : entry_mask=0x00001fe0 alias_mask=0x00001000 n_aliases=2
D-cache : n_ways=1 n_sets=512 way_incr=16384
D-cache : entry_mask=0x00003fe0 alias_mask=0x00003000 n_aliases=4
Mount-cache hash table entries: 512
CPU: SH7750
NET: Registered protocol family 16
DMA: Registering DMA API.
DMA: Registering sh_dmac handler (4 channels).
DMA: Registering pvr2_dmac handler (1 channel).
DMA: Registering g2_dmac handler (4 channels).
Autoconfig PCI channel 0x8c1e23f0
Scanning bus 00, I/O 0x01001600:0x01003600, Mem 0x01840000:0x01848000
00:00.0 Class 0200: 11db:1234 (rev 10)
        I/O at 0x01001600 [size=0x100]
        Mem at 0x01840000 [size=0x100]
PCI: Fixing up device 0000:00:00.0
Time: SuperH clocksource has been installed.
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 512 (order: 0, 4096 bytes)
TCP bind hash table entries: 512 (order: -1, 2048 bytes)
TCP: Hash tables configured (established 512 bind 512)
TCP reno registered
sq: Registering store queue API.
Total HugeTLB memory allocated, 0
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
Fault in unaligned fixup: 0000 [#1]
Modules linked in:

Pid : 1, Comm:              swapper
PC is at request_dma+0x2a/0x84
PC  : 8c10d666 SP  : 8c255e70 SR  : 400000f1 TEA : 0000001a    Not
tainted
R0  : 00000000 R1  : 00000001 R2  : 8c1e2210 R3  : 8c1e2210
R4  : 00000004 R5  : 8c1b0394 R6  : 000000c6 R7  : 8c247ee8
R8  : ffffffea R9  : 00000000 R10 : 00000000 R11 : 8c1b0394
R12 : ffffffed R13 : 8c1fb468 R14 : 00000000
MACH: 00000000 MACL: 00000005 GBR : 00000000 PR  : 8c10d656

Call trace: 
[<8c1f26e8>] pvr2fb_dc_init+0x9c/0x108
[<8c1f298a>] pvr2fb_init+0x236/0x26c
[<8c063018>] ifind+0x14/0x98
[<8c0127f4>] acquire_console_sem+0x0/0xb4
[<8c087884>] sysfs_ilookup_test+0x0/0xa
[<8c06310a>] ilookup5_nowait+0x2a/0x44
[<8c0879d8>] sysfs_addrm_finish+0x18/0x248
[<8c0878b8>] sysfs_addrm_start+0x2a/0x9e
[<8c086d6e>] sysfs_add_file+0x56/0xc0
[<8c0127f4>] acquire_console_sem+0x0/0xb4
[<8c1f25ae>] fb_console_init+0xae/0x134
[<8c0127f4>] acquire_console_sem+0x0/0xb4
[<8c1ea848>] kernel_init+0x90/0x244
[<8c0035e4>] kernel_thread_helper+0x4/0x10
[<8c1ea7b8>] kernel_init+0x0/0x244
[<8c0035e0>] kernel_thread_helper+0x0/0x10

Process: swapper (pid: 1, stack limit = 8c254001)
Stack: (0x8c255e70 to 0x8c256000)
5e60:                                     8c1f26e8 8c208644 00000000
8c1dd8f4 
5e80: 8c1dd90c 8c1f298a 8c205cd4 8c291508 00000002 8c1b0038 00000000
8c1dd8c0 
5ea0: 8c254000 8c247998 00000000 8c1afe54 00000000 8c29e4c0 8c1afe54
00000000 
5ec0: 8c063018 8c1fb464 8c0127f4 8c2085b4 8c2915b4 8c087884 8c254000
8c06310a 
5ee0: 8c0879d8 8c244a00 00000000 8c0878b8 8c086d6e 8c1fb464 8c0127f4
8c2085b4 
5f00: 8c2915b4 8c1dd8c0 8c2914e4 8c2915b4 00000000 00000000 8c1f25ae
8c0127f4 
5f20: 8c2085b4 8c2085bc 00000000 00000000 8c1ea848 00000000 00000000
00000000 
5f40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 
5f60: 00000000 00000000 00000000 00000000 00000001 00000000 00000000
00000000 
5f80: 8c0035e4 00000000 00000000 00000000 00000000 00000000 00000000
00000000 
5fa0: 00000000 00000000 00000000 00000000 00000000 8c1ea7b8 00000000
00000000 
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8c255fa0 
5fe0: 8c0035e0 00000000 40000000 00000000 00000000 00000000 00000000
00000000 
Kernel panic - not syncing: Attempted to kill init!
Rebooting in 3 seconds..